CN105953138B - A kind of machine vision light source device that light spot shape is controllable and its implementation - Google Patents

A kind of machine vision light source device that light spot shape is controllable and its implementation Download PDF

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Publication number
CN105953138B
CN105953138B CN201610290241.3A CN201610290241A CN105953138B CN 105953138 B CN105953138 B CN 105953138B CN 201610290241 A CN201610290241 A CN 201610290241A CN 105953138 B CN105953138 B CN 105953138B
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China
Prior art keywords
spot shape
light spot
light source
machine vision
source device
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CN201610290241.3A
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CN105953138A (en
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林家平
陈新度
王晗
刘湛基
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Guangdong University of Technology
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Guangdong University of Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/02Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00Fastening of light sources or lamp holders
    • F21V19/001Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40Lighting for industrial, commercial, recreational or military use
    • F21W2131/403Lighting for industrial, commercial, recreational or military use for machines

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention discloses a kind of machine vision light source device that light spot shape is controllable and its implementation, device includes bottom plate, shell, moving component, LED module and microcontroller, the bottom plate is equipped with arc orbit, the moving component includes big internal gear, pinion gear, small machine, sliding block and slider track, the big internal gear and pinion fits, the big internal gear is fixed on the shell, the pinion gear is fixed on the output end of small machine, the small machine is fixed on sliding block, the small machine is also connect with microcontroller, the sliding block slides on slider track, the LED module is located on arc orbit and is connect with sliding block, pinion gear in the moving component, small machine, sliding block, slider track and LED module are distributed several groups on the circular array centered on by bottom plate center.The present invention has the advantages that applicability is wide, convenient and detection efficiency is high, can be widely applied to optical field.

Description

A kind of machine vision light source device that light spot shape is controllable and its implementation
Technical field
The present invention relates to optical field, especially a kind of machine vision light source device that light spot shape is controllable and its realization side Method.
Background technology
Machine vision technique is a cross discipline for being related to multiple fields.Machine vision is exactly to replace human eye with machine To measure and judge.NI Vision Builder for Automated Inspection refers to by image-pickup device come the picture signal of acquisition testing target, so After send dedicated image processing system to, obtain detection target shape information, according to the letters such as pixel distribution and brightness, color Breath is transformed into the digitized signal of our needs.Because machine vision is detected and judges by machine, commonly use The hazardous environment or the implacable occasion of human eye vision of people are detected, are not suitable in the product quality of high volume production process.And And machine vision substantially increases the accuracy and speed of detection, avoids deviation and error that eye-observation is brought.Nowadays, Chinese Just becoming world's machine vision and developing one of most active area, the application range of machine vision covers industry, agricultural, doctor The industry-by-industry of the national economy such as medicine, military affairs, space flight, meteorology, astronomy, public security, traffic, safety, scientific research.
In NI Vision Builder for Automated Inspection, input port is image-pickup device, and original input signal is picture signal.Therefore it takes the photograph It gets a good visual effect and the big image of contrast can greatly reduce the image processing work amount in later stage.However, currently, The light spot shape of lighting source on the market is fixed.And it is a variety of that NI Vision Builder for Automated Inspection, which needs the shape of the part detected, Various, including round, square, regular hexagon and triangle etc..Come to be non-according to the limited circular light spot of homogeneous area Circular pieces illuminate, and frequently can lead to part edge and homogenous characteristics (homogenous characteristics are usually to be laid out according to the shape of part) Uneven illumination it is even, the image absorbed in this way can be led because the uneven illumination of feature in image is even after image procossing Part edge and homogenous characteristics is caused separating phenomenon occur, to which required information can not be extracted.
In conclusion the lighting source light spot shape of current machine vision is fixed, it is difficult to meet different shape parts Testing requirements, applicability is not wide, and not convenient enough, detection efficiency is low.
Invention content
In order to solve the above technical problems, it is an object of the invention to:It is high to provide a kind of wide applicability, convenience and detection efficiency , the controllable machine vision light source device of light spot shape.
Another object of the present invention is to:There is provided that a kind of applicability is wide, convenient and detection efficiency is high, light spot shape is controllable Machine vision light source device implementation method.
The technical solution used in the present invention is:
A kind of machine vision light source device that light spot shape is controllable, including bottom plate, shell, moving component, LED module and list Piece machine, the bottom plate are equipped with arc orbit, and the moving component includes big internal gear, pinion gear, small machine, sliding block and cunning Block track, the big internal gear and pinion fits, the big internal gear are fixed on the shell, and the pinion gear is fixed on small electricity The output end of machine, the small machine are fixed on sliding block, and the small machine is also connect with microcontroller, and the sliding block is in slider track Upper sliding, the LED module are located on arc orbit and are connect with sliding block, pinion gear, small machine, cunning in the moving component Block, slider track and LED module are distributed several groups on the circular array centered on by bottom plate center.
Further, the LED module includes LED rectangular arrays, module shell and diffusing panel, the LED rectangular arrays It is located at the inside of module shell, the diffusing panel is pasted onto on module shell.
Further, pinion gear, small machine, sliding block, slider track and the LED module in the moving component are the bottom of with The multiple that the group number being distributed on circular array centered on plate center is 12 or 12.
Further, the number of the LED module is 12 groups, should when every group of LED module is evenly distributed on arc orbit The light spot shape that device generates is circle;When 12 groups of LED modules are divided into four big groups, and it is tightly attached to per the 3 groups of LED modules organized greatly Together, when then four big group LED modules are evenly distributed on arc orbit, the light spot shape which generates is rectangular;When 12 Group LED module is divided into three big groups, and is close together per the 4 groups of LED modules organized greatly, and then three big group LED modules are uniformly divided For cloth when on arc orbit, the light spot shape which generates is triangle.
Further, the slider track is made of inner slide track and outer slide track, the inner slide track and outer cunning The pulley for being slided on slider track with movable slider is equipped on block track.
Further, the centre bore that entrance is acquired as camera review is additionally provided on the bottom plate, the shell also is provided with With bottom plate centre bore of the same size.
Further, the output axis connection that the pinion gear passes through spline and small machine.
Further, the big internal gear is fixed by screws on shell, and the LED module is fixed by screws in sliding block On.
Another program is used by the present invention solves its technical problem:
A kind of implementation method for the machine vision light source device that light spot shape is controllable, including:
S1, the Image Acquisition that the controllable machine vision light source device of light spot shape is fixed on to Machine Vision Inspecting System End, and make video camera axle center and the centre bore of bottom plate and the centre bore of shell to the heart;
S2, the illuminator level that the controllable machine vision light source device of light spot shape is adjusted to setting;
S3, part to be detected is placed in illumination zone center, presses the controllable machine vision light source device of light spot shape Light source button makes the light supply apparatus start to work, and the light spot shape that the light supply apparatus generates at this time is circle;
S4, judge whether part to be detected is circular pieces, if so, start to acquire the image of part to be detected, conversely, Then by adjusting the shape that the light spot shape that microcontroller and moving component make the light supply apparatus generate is part to be detected, and it is corresponding Ground rotates part to be measured or adjusts the illuminator level of the light supply apparatus, then starts the image for acquiring part to be detected.
The advantageous effect of the device of the invention is:Including bottom plate, shell, moving component, LED module and microcontroller, movement Component includes big internal gear, pinion gear, small machine, sliding block and slider track, and heart circle in the soleplate is controlled by microcontroller Small machine on shape array, and combine sliding block and slider track change LED module arc orbit relative position, so as to Change the shape of hot spot for the shape of different parts so that the Illumination Distribution of hot spot and the shape of part match, and meet not With the testing requirements of shape part, applicability is wide, convenient, and detection efficiency is high.Further, LED module is equipped with diffused reflector, can make Light it is more uniform in spatial distribution, light is softer.Further, it is equipped with and is used on inner slide track and outer slide track With the pulley that movable slider slides on slider track, reduce the frictional force that sliding block moves on slider track, it is more convenient.
The beneficial effects of the method for the present invention is:When part to be detected is circular pieces, it can directly start to acquire to be detected The image of part;When part to be detected is non-circular part, the light supply apparatus is set to generate by adjusting microcontroller and moving component Light spot shape be part to be detected shape, and correspondingly rotate part to be measured or adjust the illuminator level of the light supply apparatus, Then the image for starting to acquire part to be detected again, need not replace light source, it is preferable that NI Vision Builder for Automated Inspection can also collect quality Image, it is simple to operate, be suitable for different shape parts detection, improve the detection efficiency of NI Vision Builder for Automated Inspection.
Description of the drawings
Fig. 1 is the array structure schematic diagram for the LED module that the present invention generates circular light spot;
Fig. 2 is the internal structure schematic diagram of moving component of the present invention;
Fig. 3 is a kind of local interior's structure sectional view for the machine vision light source device that light spot shape is controllable of the present invention;
Fig. 4 is a kind of step flow chart of the implementation method for the machine vision light source device that light spot shape is controllable of the present invention;
Fig. 5 is that the illuminator level of the embodiment of the present invention two adjusts structural schematic diagram.
Reference numeral:1, bottom plate;2, LED rectangular arrays;3, centre bore;4, screw;5, diffusing panel;6, big internal gear;7、 Pinion gear;8, small machine;9, module shell;10, sliding block;11 and 13, outer slide track;12, pulley;14 and 15, inner slide rail Road;16, shell;17, arc orbit.
Specific implementation mode
Referring to Fig.1,2 and 3, a kind of machine vision light source device that light spot shape is controllable, including bottom plate, shell, movement portion Part, LED module and microcontroller, the bottom plate are equipped with arc orbit, and the moving component includes big internal gear, pinion gear, small Motor, sliding block and slider track, the big internal gear and pinion fits, the big internal gear is fixed on the shell, described Pinion gear is fixed on the output end of small machine, and the small machine is fixed on sliding block, and the small machine is also connect with microcontroller, institute It states sliding block to slide on slider track, the LED module is located on arc orbit and connect with sliding block, in the moving component If pinion gear, small machine, sliding block, slider track and LED module are distributed on the circular array centered on by bottom plate center Dry group.
Referring to Fig.1,2 and 3, it is further used as preferred embodiment, the LED module includes LED rectangular arrays, module Shell and diffusing panel, the LED rectangular arrays are located at the inside of module shell, and the diffusing panel is pasted onto on module shell.
It is further used as preferred embodiment, pinion gear, small machine in the moving component, sliding block, slider track And the multiple organized number and be 12 or 12 that LED module is distributed on the circular array centered on by bottom plate center.
It is further used as preferred embodiment, the number of the LED module is 12 groups, when every group of LED module is uniformly divided For cloth when on arc orbit, the light spot shape which generates is circle;When 12 groups of LED modules are divided into four big groups, and per big 3 groups of LED modules of group are close together, when then four big group LED modules are evenly distributed on arc orbit, what which generated Light spot shape is rectangular;It when 12 groups of LED modules are divided into three big groups, and is close together per the 4 groups of LED modules organized greatly, then When three big group LED modules are evenly distributed on arc orbit, the light spot shape which generates is triangle.
Wherein, if as soon as sharing 12 groups of LED modules, light spot shape is uniformly distributed when being round;When light spot shape is rectangular, 12 groups are equally divided into 4 big groups, that is, adjacent 3 groups stick together.Triangle, hexagon are also same reason.
With reference to Fig. 3, it is further used as preferred embodiment, the slider track is by inner slide track and outer slide track It forms, the pulley for being slided on slider track with movable slider is equipped on the inner slide track and outer slide track.
Referring to Fig.1, be further used as preferred embodiment, be additionally provided on the bottom plate as camera review acquire into The centre bore of mouth, the shell also are provided with and bottom plate centre bore of the same size.
It is further used as preferred embodiment, the output axis connection that the pinion gear passes through spline and small machine.
It is further used as preferred embodiment, the big internal gear is fixed by screws on shell, the LED module It is fixed by screws on sliding block.
Reference Fig. 4, a kind of implementation method for the machine vision light source device that light spot shape is controllable, including:
S1, the Image Acquisition that the controllable machine vision light source device of light spot shape is fixed on to Machine Vision Inspecting System End, and make video camera axle center and the centre bore of bottom plate and the centre bore of shell to the heart;
S2, the illuminator level that the controllable machine vision light source device of light spot shape is adjusted to setting;
S3, part to be detected is placed in illumination zone center, presses the controllable machine vision light source device of light spot shape Light source button makes the light supply apparatus start to work, and the light spot shape that the light supply apparatus generates at this time is circle;
S4, judge whether part to be detected is circular pieces, if so, start to acquire the image of part to be detected, conversely, Then by adjusting the shape that the light spot shape that microcontroller and moving component make the light supply apparatus generate is part to be detected, and it is corresponding Ground rotates part to be measured or adjusts the illuminator level of the light supply apparatus, then starts the image for acquiring part to be detected.
Invention is further described in detail with specific embodiment with reference to the accompanying drawings of the specification.
Embodiment one
As shown in Figure 1, 2, 3, machine vision light source device of the present invention, including bottom plate 1, shell 16, moving component, microcontroller And LED module.Bottom plate 1 has centre bore 3 and arc orbit 17, wherein the centre bore 3 of bottom plate 1 is NI Vision Builder for Automated Inspection camera shooting Machine acquires image entrance.Shell 16 equally has and an equal amount of centre bore of bottom plate 3.In addition, moving component includes big internal gear 6, pinion gear 7, small machine 8, sliding block 10, pulley 12 and slider track.Wherein, slider track includes inner slide track 15,14 And outer slide track 13,11.Small machine 8 is fixed on by connector (there is no drawn in attached drawing for it) on sliding block 10.Small tooth Wheel 7 is connect with 8 output shaft of motor by spline (there is no drawn in attached drawing for it).Pulley 12 is moved to reduce sliding block 10 Frictional force.The other parts and LED module of (big internal gear only has 1) are with bottom plate 1 other than big internal gear in moving component The circular array at center is distributed several, and the number being distributed is 12 or 12 multiples.And LED module include module shell 9, LED rectangular arrays 2 and diffusing panel 5, wherein diffusing panel 5 is pasted onto on module shell.LED module is connected with sliding block 10 by screw 4 It connects.Each small machine 8 is separately connected the I/O port of microcontroller (there is no draw in attached drawing for it), small individually to control by microcontroller Motor 8.
Machine vision light source device of the present invention, each small machine 8 is controlled by microcontroller receives pulse number to control The movement of each small machine 8 is made, and then control slide block 10 finally controls the device hot spot in the relative position of arc orbit 17 Shape.By taking the number of LED module is 12 groups as an example, when every group of LED module is evenly distributed on arc orbit 17, device production Raw light spot shape is circle;When 12 groups of LED modules are divided into four big groups, and it is close together per the 3 groups of LED modules organized greatly, Then when four big group LED modules are evenly distributed on arc orbit 17, the light spot shape which generates is rectangular;When 12 groups LED module is divided into three big groups, and is close together per the 4 groups of LED modules organized greatly, and then three big group LED modules are uniformly distributed When on arc orbit 17, the light spot shape which generates is triangle.And so on, other shapes can be obtained.Due to When generating different light spot shapes, the number of every group of LED module is different, causes the light-emitting area of every group of LED module different, so Its illuminator level will be finely tuned slightly, so that reach better illuminating effect.
Embodiment two
For the ease of being operated, a kind of shell 16 for the machine vision light source device that light spot shape is controllable of the present invention is equipped with Such as lower button:" ON/OFF ", " rectangular ", " circle ", " triangle " and " hexagon " etc..
The implementation method of machine vision light source device of the present invention the specific steps are:
S1, the Image Acquisition that the controllable machine vision light source device of this light spot shape is fixed on to Machine Vision Inspecting System End, and make video camera axle center and the centre bore 3 of bottom plate and the centre bore 3 of shell to the heart.
S2, the illuminator level that machine vision light supply apparatus is adjusted to setting.
S3, detection part is placed in illumination zone center, presses light source " ON/OFF " button, light source working, hot spot at this time For circle.
S4, judge whether part to be detected is circular pieces, if so, pressing " circle " button, directly start acquisition and wait for The image of part is detected, (such as " triangle " button, which passes through tune conversely, then pressing the button that other match with part The light spot shape that microcontroller and moving component inside section make the light supply apparatus generate is the shape of part to be detected), and it is corresponding Ground rotates part to be measured or adjusts the illuminator level of the light supply apparatus, then starts the image for acquiring part to be detected.
S5, image has been acquired, has pressed light source " ON/OFF " button, the light spot shape which generates reverts to circle Shape, finally the light supply apparatus be stopped.
The NI Vision Builder for Automated Inspection light supply apparatus of the present invention uses LED module as light source, belongs to direct lighting source. In order to enable spot center is more uniform, the illuminator level of light source should have a proper range.As shown in fig. 5, it is assumed that LED module is interior Radius is r1, outer radius r2, illuminator level h has with reference to the method for adjusting height of patent of invention CN201510128214.1:
For with the relevant coefficient of the LED module characteristics of luminescence, the light that LED rectangular arrays generate is dissipated using diffusing panel It penetrates, uniform-illumination of the light on diffusing panel, so the characteristic close of the characteristics of luminescence of LED module and Lambertian source.So m ≈ 1, have:
Then the illuminator level adjusting range of light source is [h- Δs r, h+ Δ r], and wherein Δ r is 5mm~15mm.
Such as:r1=70mm, r2=110mm;Then h ≈ 130mm, so illumination proper range is 120mm~140mm.
Compared with prior art, the present invention has the following advantages:
(1) each small machine of the central circular array of bottom plate is controlled by microcontroller, is controlled the bottom of at by microcontroller Small machine on plate central circular array, and sliding block and slider track is combined to change LED module in the opposite position of arc orbit It sets, so as to change the shape of hot spot for the shape of different parts so that the shape phase of the Illumination Distribution of hot spot and part Match, meet the testing requirements of different shape parts, applicability is wide, convenient, and detection efficiency is high.Even if accessory size is more than hot spot Homogeneity range, the edge that can also ensure that part is identical with the illumination of homogenous characteristics, and non-similar feature illumination is different, is more convenient for Image procossing.
(2) LED module is equipped with diffused reflector, enables to light more uniform in spatial distribution, light is softer.
(3) pulley for being slided on slider track with movable slider is equipped on inner slide track and outer slide track, Reduce the frictional force that sliding block moves on slider track, it is more convenient
(4) source operation is convenient and simple.Light source need not be replaced, machine system can also collect the preferable image of quality.
It is to be illustrated to the preferable implementation of the present invention, but the invention is not limited to the implementation above Example, those skilled in the art can also make various equivalent variations or be replaced under the premise of without prejudice to spirit of that invention It changes, these equivalent deformations or replacement are all contained in the application claim limited range.

Claims (8)

1. a kind of machine vision light source device that light spot shape is controllable, it is characterised in that:Including bottom plate, shell, moving component, LED module and microcontroller, the bottom plate are equipped with arc orbit, and the moving component includes big internal gear, pinion gear, small electricity Machine, sliding block and slider track, the big internal gear and pinion fits, the big internal gear is fixed on the shell, described small Gear is fixed on the output end of small machine, and the small machine is fixed on sliding block, and the small machine is also connect with microcontroller, described Sliding block slides on slider track, and the LED module is located on arc orbit and is connect with sliding block, small in the moving component Gear, small machine, sliding block, slider track and LED module are distributed several on the circular array centered on by bottom plate center Group, and organize the multiple that number is 12 or 12, wherein distribution refers to dividing on several circles for constituting circular array on circular array The center of circle of cloth, several circles for constituting circular array is identical at a distance from bottom plate center.
2. a kind of controllable machine vision light source device of light spot shape according to claim 1, it is characterised in that:It is described LED module includes LED rectangular arrays, module shell and diffusing panel, and the LED rectangular arrays are located at the inside of module shell, The diffusing panel is pasted onto on module shell.
3. a kind of controllable machine vision light source device of light spot shape according to claim 1, it is characterised in that:It is described The number of LED module is 12 groups, when every group of LED module is evenly distributed on arc orbit, the light spot shape of device generation For circle;It when 12 groups of LED modules are divided into four big groups, and is close together per the 3 groups of LED modules organized greatly, then four big group LED When module is evenly distributed on arc orbit, the light spot shape which generates is rectangular;When 12 groups of LED modules are divided into three greatly Group, and be close together per the 4 groups of LED modules organized greatly, when then three big group LED modules are evenly distributed on arc orbit, The light spot shape that the device generates is triangle.
4. a kind of controllable machine vision light source device of light spot shape according to claim 1, it is characterised in that:The cunning Block track is made of inner slide track and outer slide track, is equipped on the inner slide track and outer slide track for driving The pulley that sliding block slides on slider track.
5. a kind of controllable machine vision light source device of light spot shape according to claim 1, it is characterised in that:The bottom The centre bore that entrance is acquired as camera review is additionally provided on plate, the shell also is provided with and bottom plate center of the same size Hole.
6. according to a kind of machine vision light source device that light spot shape is controllable of claim 1-5 any one of them, feature exists In:The output axis connection that the pinion gear passes through spline and small machine.
7. according to a kind of machine vision light source device that light spot shape is controllable of claim 1-5 any one of them, feature exists In:The big internal gear is fixed by screws on shell, and the LED module is fixed by screws on sliding block.
8. a kind of implementation method for the machine vision light source device that light spot shape as described in claim 1 is controllable, feature exist In:Including:
S1, the Image Acquisition end that the controllable machine vision light source device of light spot shape is fixed on to Machine Vision Inspecting System, and And make video camera axle center and the centre bore of bottom plate and the centre bore of shell to the heart;
S2, the illuminator level that the controllable machine vision light source device of light spot shape is adjusted to setting;
S3, part to be detected is placed in illumination zone center, presses the light source of the controllable machine vision light source device of light spot shape Button makes the light supply apparatus start to work, and the light spot shape that the light supply apparatus generates at this time is circle;
S4, judge whether part to be detected is circular pieces, if so, starting to acquire the image of part to be detected, conversely, then leading to It overregulates the light spot shape that microcontroller and moving component make the light supply apparatus generate and is the shape of part to be detected, and correspondingly revolve Turn part to be measured or adjust the illuminator level of the light supply apparatus, then starts the image for acquiring part to be detected.
CN201610290241.3A 2015-12-31 2016-05-03 A kind of machine vision light source device that light spot shape is controllable and its implementation Expired - Fee Related CN105953138B (en)

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CN104763928A (en) * 2015-03-23 2015-07-08 广东工业大学 LED (Light Emitting Diode) light source for machine vision system and controlling method thereof

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